/*
 * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
 *
 *
 */
package javax.swing.plaf.synth;

import javax.swing.*;
import javax.swing.plaf.FontUIResource;
import java.awt.Font;
import java.util.*;
import java.util.regex.*;
import sun.swing.plaf.synth.*;
import sun.swing.BakedArrayList;

/**
 * Factory used for obtaining styles. Supports associating a style based on
 * the name of the component as returned by <code>Component.getName()</code>,
 * and the <code>Region</code> associated with the <code>JComponent</code>.
 * Lookup is done using regular expressions.
 *
 * @author Scott Violet
 */
class DefaultSynthStyleFactory extends SynthStyleFactory {

  /**
   * Used to indicate the lookup should be done based on Component name.
   */
  public static final int NAME = 0;
  /**
   * Used to indicate the lookup should be done based on region.
   */
  public static final int REGION = 1;

  /**
   * List containing set of StyleAssociations used in determining matching
   * styles.
   */
  private List<StyleAssociation> _styles;
  /**
   * Used during lookup.
   */
  private BakedArrayList _tmpList;

  /**
   * Maps from a List (BakedArrayList to be precise) to the merged style.
   */
  private Map<BakedArrayList, SynthStyle> _resolvedStyles;

  /**
   * Used if there are no styles matching a widget.
   */
  private SynthStyle _defaultStyle;


  DefaultSynthStyleFactory() {
    _tmpList = new BakedArrayList(5);
    _styles = new ArrayList<StyleAssociation>();
    _resolvedStyles = new HashMap<BakedArrayList, SynthStyle>();
  }

  public synchronized void addStyle(DefaultSynthStyle style,
      String path, int type) throws PatternSyntaxException {
    if (path == null) {
      // Make an empty path match all.
      path = ".*";
    }
    if (type == NAME) {
      _styles.add(StyleAssociation.createStyleAssociation(
          path, style, type));
    } else if (type == REGION) {
      _styles.add(StyleAssociation.createStyleAssociation(
          path.toLowerCase(), style, type));
    }
  }

  /**
   * Returns the style for the specified Component.
   *
   * @param c Component asking for
   * @param id ID of the Component
   */
  public synchronized SynthStyle getStyle(JComponent c, Region id) {
    BakedArrayList matches = _tmpList;

    matches.clear();
    getMatchingStyles(matches, c, id);

    if (matches.size() == 0) {
      return getDefaultStyle();
    }
    // Use a cached Style if possible, otherwise create a new one.
    matches.cacheHashCode();
    SynthStyle style = getCachedStyle(matches);

    if (style == null) {
      style = mergeStyles(matches);

      if (style != null) {
        cacheStyle(matches, style);
      }
    }
    return style;
  }

  /**
   * Returns the style to use if there are no matching styles.
   */
  private SynthStyle getDefaultStyle() {
    if (_defaultStyle == null) {
      _defaultStyle = new DefaultSynthStyle();
      ((DefaultSynthStyle) _defaultStyle).setFont(
          new FontUIResource(Font.DIALOG, Font.PLAIN, 12));
    }
    return _defaultStyle;
  }

  /**
   * Fetches any styles that match the passed into arguments into
   * <code>matches</code>.
   */
  private void getMatchingStyles(List matches, JComponent c,
      Region id) {
    String idName = id.getLowerCaseName();
    String cName = c.getName();

    if (cName == null) {
      cName = "";
    }
    for (int counter = _styles.size() - 1; counter >= 0; counter--) {
      StyleAssociation sa = _styles.get(counter);
      String path;

      if (sa.getID() == NAME) {
        path = cName;
      } else {
        path = idName;
      }

      if (sa.matches(path) && matches.indexOf(sa.getStyle()) == -1) {
        matches.add(sa.getStyle());
      }
    }
  }

  /**
   * Caches the specified style.
   */
  private void cacheStyle(List styles, SynthStyle style) {
    BakedArrayList cachedStyles = new BakedArrayList(styles);

    _resolvedStyles.put(cachedStyles, style);
  }

  /**
   * Returns the cached style from the passed in arguments.
   */
  private SynthStyle getCachedStyle(List styles) {
    if (styles.size() == 0) {
      return null;
    }
    return _resolvedStyles.get(styles);
  }

  /**
   * Creates a single Style from the passed in styles. The passed in List
   * is reverse sorted, that is the most recently added style found to
   * match will be first.
   */
  private SynthStyle mergeStyles(List styles) {
    int size = styles.size();

    if (size == 0) {
      return null;
    } else if (size == 1) {
      return (SynthStyle) ((DefaultSynthStyle) styles.get(0)).clone();
    }
    // NOTE: merging is done backwards as DefaultSynthStyleFactory reverses
    // order, that is, the most specific style is first.
    DefaultSynthStyle style = (DefaultSynthStyle) styles.get(size - 1);

    style = (DefaultSynthStyle) style.clone();
    for (int counter = size - 2; counter >= 0; counter--) {
      style = ((DefaultSynthStyle) styles.get(counter)).addTo(style);
    }
    return style;
  }
}
